#1 grain n. a relatively small granular particle of a substance; "a grain of sand"; "a grain of sugar". wn
#2 grain n. [food grain, cereal] foodstuff prepared from the starchy grains of cereal grasses. wn
#3 grain v. [ingrain] thoroughly work in; "His hands were grained with dirt". wn
#4 grain v. paint (a surface) to make it look like stone or wood. wn
#5 grain v. [granulate] form into grains. wn
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